Nucleus - The centre of an atom, Proton - Positively charged sub atomic particle, Electron - Negatively charged sub atomic particle, Neutron - Neutral sub atomic particle, Mass number - The number of protons plus the neutrons (number of particles in the nucleus), Energy level - These hold the electrons, Atomic (proton) number - The number of protons which is also the number of electrons,

Atomic structure match up activity

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